验证码框架:SimpleCaptcha

转载：http://blog.ntsky.com/simplecaptcha.html

 

使用SimpleCaptcha可以方便灵活的生成各种验证码。

下载SimpleCaptcha : http://sourceforge.net/project/platformdownload.php?group_id=147810&sel_platform=13579

添加到ClassPath中，在web.xml中的设置:

XML/HTML代码

 <servlet>  
    <servlet-name>Captcha</servlet-name>   
    <servlet-class>nl.captcha.servlet.CaptchaServlet</servlet-class>   
    <init-param>   
        <param-name>cap.font.color</param-name>   
        <param-value>0,0,255</param-value>   
    </init-param>   
    <init-param>   
        <param-name>cap.char.arr</param-name>   
        <param-value>1,2,3,4,5,6,7,8,9,0</param-value>   
    </init-param>   
    <init-param>   
        <param-name>cap.border</param-name>   
        <param-value>yes</param-value>   
    </init-param>           
    <init-param>   
        <param-name>cap.border.c</param-name>   
        <param-value>black</param-value>   
    </init-param>           
    <init-param>   
        <param-name>cap.border.th</param-name>   
        <param-value>1</param-value>   
    </init-param>       
    <init-param>   
        <param-name>cap.background.c.to</param-name>   
        <param-value>255,255,255</param-value>   
    </init-param>   
    <init-param>   
        <param-name>cap.background.c.from</param-name>   
        <param-value>255,255,255</param-value>   
    </init-param>               
</servlet>   
<servlet-mapping>   
    <servlet-name>Captcha</servlet-name>   
    <url-pattern>/servlet/Captcha.jpg</url-pattern>   
</servlet-mapping>   

 

html中增加<img style="border:0;" id="captchaImg" src="/servlet/Captcha.jpg" border="0"/>

验证码效果图片:

Java代码中可以通过req.getSession().getAttribute("SIMPLE_CAPCHA_SESSION_KEY")来取得验证码的值。

注意：

LINUX操作系统没有装x11的情况下，需要注释nl.captcha.text.imp.DefaultWordRenderer类的

XML/HTML代码

/*   
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();    
               
  GraphicsDevice gd = ge.getDefaultScreenDevice();    
  GraphicsConfiguration gc = gd.getDefaultConfiguration();    
*/  

 

不然会有错误。